1. Different definitions: Hexagonal washers are tools for connecting bolts, while flange heads are parts for connecting machinery and equipment, and pipes.
2. Different structures: Hexagonal washers are usually composed of hexagonal nuts, hexagonal bolts, flat washers, spring washers, and other components, while flange heads are composed of flange plates and flange gaskets and need to be connected with bolts or nuts.
3. Different functions: Hexagonal washers mainly fix and prevent loosening, while flange heads fix and seal.
4. Different application scenarios: Hexagonal washers are mainly suitable for occasions that require bolt connection, such as mechanical equipment, automobile manufacturing, and other fields; flange heads are ideal for various pipelines, containers, and equipment, such as chemical, petroleum, natural gas,s and other fields.